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The DC power supply systems of telecom applications for broadband and Internet access have increasing energy demands. However, in many cases the available space for the installation is already used to its maximum. A lithium ion battery can be the solution because of the higher energy density of about 150 Wh/kg and 380 Wh/l, good discharging performance and an operating range from -30degC to 60degC...
The situation of battery manufacturer as well as of the customer has changed dramatically in the past 15 years, leading to strong competition, pressure on price, increased safety, power and life requirements. The controversial requirements and interests of customers as well as of the battery manufactures are listed. Negative impacts and risks of the changes and requirements are mentioned and possible...
We estimated the lifetimes of large-capacity lithium-ion secondary cells in high-temperature-acceleration tests under variable maintaining voltages. The decrease in capacity was exacerbated by the temperature increase, and we found a strong correlation between the lifetime and temperature, in agreement with Arrhenius' law. The lifetime, which was effected by the charge voltage, was over 10 years at...
Over the last 25 years AVESTOR has developed a revolutionary design for stationary lithium-metal-polymer (LMP) batteries. Through extensive research and development, AVESTOR's efforts have resulted in a battery that offers a new level of high energy density, reliability and long life under the most extreme environmental conditions. Since 2004, LMP-technology batteries have been deployed in volume...
Those of us who depend on batteries often feel that we are flying blind. Some of us use instruments to help navigate the question: "what condition are our batteries in?" Yet, most of us want something simpler to use - something more definitive - less ambiguous - more useful. When you first read through literature that has been written over the last decade and a half on the subject of battery...
We studied the life characteristics of LiCoO2 based lithium-ion batteries for mobile phones using a high-temperature acceleration technique. The charge/discharge cycle and storage life of the batteries were systematically examined at 50 degC. We also examined the synergistic effect of combining these two elements. The results indicated that the generation and destruction of the solid electrolyte interface...
This paper is a continuation to the author's previous paper on novel lithium-ion battery charger based on pulse charging technique where a central power supply acting as a controlled current source is sequentially connected in parallel with different batteries through an array of switches. Here the idea is extended to more wide range of AC-DC applications. Though the idea of central power supply can...
We estimated the capacity and life expectancy of 100-Ah-scale large nickel metal hydride backup batteries. The proposed method is based on the correlation between the voltage drop after charge cessation and the capacity of degraded batteries. The magnitude of the voltage drop varies with the environmental temperature, but a method of offsetting this temperature dependence is described. Capacity estimation...
Fuel cells have a high potential to store a higher amount of energy in comparison to lithium ion accumulators and other secondary batteries. About all this euphoric assessment of the potential of this technology sometimes the cost and state of the art facts fail in oblivion. On this we look carefully on prices and requirements from the applications point of view to develop successful mass and niche...
The IEC 61427 Ed.2 applies to all lead-acid and nickel-cadmium cells and batteries for photovoltaic energy systems (PVES). This standard gives general information relating to the requirements of the secondary batteries used in PVES and to the typical methods of test used for the verification of batteries performances. The objective is to assist the specifier in the understanding of the purpose of...
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